Originally Posted by DFC
Seriously bad practice not to let an ATS service know of any change in flight rules because while it may be class G and a free for all out there, there are many rules and requirements that change as the flight rules change and some of those affect other airspace users.
I am struggling to think of any rule/requirement changes that are going to be material to ATS or other pilots between operating IFR and VFR - other than quadrantial rule(but typically not relevant due to being below the transition level) and 1000 foot above nearest obsticle (which I struggle to see the impact of on ATS or other aircraft)